Three people were injured in the fire. One was an employee at the school and two were subcontractors.

One victim was airlifted to University of New Mexico Hospital, while the other two were taken by vehicle. All three sustained burns, but are expected to survive.

A fourth person twisted his knee carrying the injured away from the scene.

Two trucks were burned in the fire, as well.

No students were involved in the explosion.

The cause of the fire is under investigation, but an official At New Mexico Tech tells KOAT it was sparked during a controlled explosion that went awry.

"It sounds like an accident indeed," said Thomas Guengerich of the New Mexico Tech public information office. "It was a strange occurrence. It was unintentional. For that reason, we'll be looking into what happened."

The fire sparked at 12:25 p.m. and burned one structure at the facility. The fire threatened another structure within a controlled area.

School officials say on any given day, nearly a dozen controlled explosions go off on the side of the mountain where the fire occurred. It is the first time an out-of-control explosion happened on the campus in nearly 25 years, they said.

The school has cancelled further controlled explosions until investigators figure out what went wrong.

The World Anti-Doping Agency (WADA) said Sunday it was "very alarmed" by reports of widespread doping by track and field athletes in major competitions including the Olympic Games and world championships.